Price trackers and comparison tools
Tools that track product prices over time, alert on drops or restocks, and compare prices or unit costs across online retailers so shoppers can find real deals and avoid fake sales.
Built for: Online bargain shoppers
Projects since May 04
197
Different builders
190
Last 4 weeks vs 8 before
-5%
AI is the core
8.6%
Projects per week
Mostly web app (41%), browser extension (33%), mobile app (17%) · from r/SideProject, r/chrome_extensions, r/SaaS, r/IMadeThis
Latest
- Sourcerer — Tracks thrift and resale sourcing trips, allocating gas and expenses to purchased items to calculate true profit per item and per date range.“I built an iPhone app to answer "did that thrift run actually make money?" — looking for feedback from people who flip”
- ZentraFoundry Amazon ASIN snapshot actor — Saves public Amazon product-page snapshots for a list of ASINs, such as title and price, for later tracking.“We made an Amazon ASIN snapshot actor — the public sample shows title and price”
- Grocery Detective — Compares local grocery store prices and weekly deals across chains by zip code and emails saved-item digests.“I got tired of checking prices at 6 grocery stores every week so I built Grocery Detective to check them all at once”
- Barcodepedia — Provides a wiki-style database that shows information about products from their barcode, including owner, maker, ingredients, price history and reviews.“I rebuild Barcodepedia 20 years after the original release.”
- Kanjoos — Shows deals with price history, verification date, and end date, and hides stale or unverified prices.“I just launched a side project: a deals site that shows why something is actually a deal. Feedback welcome”
- BestPick — Scans Amazon product pages for all variant listings and lays out their prices by condition tier from New to Acceptable.“Made a Chrome extension that finds the cheaper variant listings Amazon buries (New, Used, Refurbished, etc.)”
- theotherapple.eu — Compares Apple feature availability, language support, subscriptions, hardware prices and consumer rights between EU countries and the US.“I made a country-by-country comparison of what Apple customers get in the EU vs the US”
- Researches a product purchase by comparing delivered prices, coupon codes, sale legitimacy, owner and video reviews, and local stock to recommend where to buy.“built an AI agent that researches my purchases for me: real delivered price, working codes, what owners actually say. would you use it?”
- Helps users stop impulse purchases before they buy.“I built an app to stop my impulse buying. Can you tell me honestly whether the idea works?”
- Tracks prices on arbitrary websites and alerts the user when they change.“I built a price tracker that works on any website”
- Spade² — Searches current shopping listings and lets users compare prices, stores, conditions, and shipping costs in one place.“I got tired of opening 10 shopping tabs, so I built this”
- Zandolie — Answers customer price and stock questions over messaging channels by checking live inventory in the store's system and hands off discounts and large orders to staff.“I built an AI sales agent that checks live stock before quoting a price. Looking for feedback from retail owners”
- Choice — Checks sourced company findings against user-selected issues while browsing and links to the underlying sources.“I built a free Chrome extension to check a company before buying from it”
- Lumo — Searches retailers for products matching a user's needs and budget, compares prices and deals, and prepares checkout and post-purchase tasks.“Thinking of building a commerce agent that gets people the best prices on the best products. Thoughts?”
- Game Hunter: PC Price Compare — Compares the current price of a PC game across 11 stores and links to purchase.“Game Hunter: PC Price Compare”
- SendCart — Saves products from URLs, shares, screenshots, photos or barcodes and alerts the user when a tracked price hits their target.“I built SendCart because I was tired of checking the same product page”
- My Price Tracking — Monitors product prices and availability across online stores and sends notifications on changes.“Introducing My Price Tracking - A Free Telegram Bot for Competitive Price Monitoring!”
- PriceRunJA — Scrapes supermarket websites weekly and lets users compare grocery prices side by side across stores.“I built a grocery price comparison site for Jamaica — comparing prices across 5 supermarkets with automated scraping”
- FreeStuffCrazy — Lists legitimate free offers, birthday freebies, and free music, with details on requirements and a tracker for birthday signups.“I’m rebuilding the free stuff site I started in college 24 years ago”
- GlowFind — Compares prices of Korean skincare products across German and EU shops, ranking offers by total price including shipping.“Built a K-Beauty price comparison for Germany that ranks by total price incl. shipping”
Most discussed
- masland.tech RAM price tracker — Tracks DDR4 and DDR5 desktop memory prices on Newegg and Amazon over time.“I've been tracking the price of RAM over the last month and it has started to trend back down”
- Selects compatible PC parts within a given budget using live Amazon prices.“Built a PC-builder that picks every compatible part for your budget, priced live from Amazon”
- Sweep — Searches multiple online stores at once for a product and tracks price history to flag fake sales.“I'm 16 and I just shipped my first real app: a price tracker that tells you when a "sale" isn't actually a sale”
- Grocery Detective — Compares local grocery store prices and weekly deals across chains by zip code and emails saved-item digests.“I got tired of checking prices at 6 grocery stores every week so I built Grocery Detective to check them all at once”
- ShopFair — Scores brands out of 100 for ethics and shows who owns them, active boycotts, and certifications.“I made an app that tells you who actually owns the brands you buy”
- Muchita — Searches other stores for a product page's item, checks variant, availability and price, and compares totals with shipping shown separately.“I built a free extension that checks whether the same product is cheaper elsewhere”
- priceerrors.app — Sends phone notifications about deals, freebies, and price errors.“I built an app that send you different deals, freebies, price errors right on your phone”
- Checks real-time retail stock and in-store clearance across major stores, compares UPC prices, and plans shopping routes.“Why I stopped using Brickseek and built my own tool instead”
- lens-prices.com — Tracks new and used camera lens listings from Amazon and eBay and lets users compare prices side by side.“I built a price tracker for camera lenses across Amazon and eBay (lens-prices.com)”
- Am I Expensive? — Scans products and calculates unit prices so different package sizes can be compared directly.“What I learned from shipping two Android apps while working full time and starting my first Unity game”